Here, in first drawing, I combine the turret of M10 and the hull of M4A3E8, my favourite components in the vast and complicated (at least, for me) field of US armor during WWII. Second is a conversion in a kind of recce or command version, with gun reduced to 50 mm or so.

Your Sherman with the smaller gun is something I have been thinking about for some time. Though, my version would keep the Sherman turret and install a 57mm/6-pdr to create an infantry support tank. Something that could have been assigned to the tank company of the infantry regiment.

Your M18 with the M8 Turret also looks like a great combination of parts. I see no reason why you could not increase the size of the main gun provided there is room for the weapon to recoil in to the confines of the turret.

Sherman turret on the M18 looks just as I had imagined it would. Wonder if there would be sufficient clearance under the turret basket for the thing to fit as a drop-in modification. Ammunition storage might be a bit less but it would be a great little tank with a speed advantage.

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"Every day we hear about new studies 'revealing' what should have been obvious to sentient beings for generations; 'Research shows wolverines don't like to be teased" -- Jonah Goldberg